Question

A balloon with a radius of 16 cm has an electric charge of 4.25 10 –9 C.

Determine the electric field strength at a distance of 40.0 cm from the balloon’s centre.

Answer 1

239 N/C

Step-by-step explanation:

Electric field strength at distance R from a charge Q is given by the expression

E = k Q / R² where Q is charge , R is distance of charge from the point . k is a constant .

R = 40 cm , Q = 4.25 x 10⁻⁹

Putting the given values

E = 9 x 10⁹ x 4.25 x 10⁻⁹ / ( 40 x 10⁻²)²

= 239 N/C .